| Abstract
| - Taste threshold tests of ferrous sulfate (FeSO4) solutions have been confounded by the presence ofputative odorants. To detect the presence of odorants released from these solutions solid-phasemicroextraction (SPME) was used to collect volatiles in the headspace above FeSO4 solutions. Gaschromatography−olfactometry of samples collected over three time periods (1, 5, and 16 h) and attwo temperatures (22 and 37 °C) revealed the presence of several metallic-smelling odorants in theheadspace. Using authentic standards, two of the odorants were conclusively identified as 1-octen-3-one and 1-nonen-3-one. Trace levels of other odorants were also detected, but dilution experimentsindicated that 1-nonen-3-one was at least 10 times more potent than anything else released fromthe solutions. 1-Octen-3-one and 1-nonen-3-one are excellent candidates for the metallic odorresponses often observed in threshold testing of solutions of FeSO4. Keywords: Metallic taste; ferrous sulfate; lipid oxidation
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